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C
 
Low Temp
C
 
Precipitation
mm
 
Sunniest
hours

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Cloudbase

Length of Day

8 hrs 31 min 2 sec
of Daylight Today
Which is
2 min 35 sec Longer
Than Yesterday
(Noon)
Day-Night Graphic
(Midnight)

Moon Phase


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Weather Underground PWS IESSEXCH11

WXSIM: Chelmer Village
Updated: Sunday, 18.01.2026 11:00 UTC
 
This
afternoon
Cloudy
Cloudy		 Tonight

Mostly Cloudy
Mostly Cloudy		 Monday

Partly Cloudy
Partly Cloudy		 Monday
night
Mostly Cloudy
Mostly Cloudy		 Tuesday

Mostly Cloudy
Mostly Cloudy		 Tuesday
night
Chance rain
Chance rain		 Wednesday

Chance rain
Chance rain		 Wednesday
night
Chance rain
Chance rain		 Thursday

Partly Cloudy
Partly Cloudy		 Thursday
night
Mostly Cloudy
Mostly Cloudy
<2 mm. 5 mm. <5 mm. 2 mm. <2 mm. <2 mm.
High: 12° Low: 6° High: 12° Low: 7° High: 11° Low: 7° High: 9° Low: 9° High: 11° Low: 7°






























 

WU Forecast: Chelmsford

Today
Cloudy
Cloudy		Tonight
Clouds Early, Clearing Late
Clouds Early, Clearing Late		Tomorrow
Cloudy
Cloudy		Tomorrow night
Cloudy
Cloudy		Tuesday
Cloudy
Cloudy		Tuesday night
Showers
Showers		Wednesday
Showers
Showers		Wednesday night
Showers
Showers		Thursday
Showers
Showers
11°C4°C11°C7°C10°C5°C8°C6°C9°C

WXSIM Forecast Accuracy

Actual Observed (Act), WxSim Generated (WS) , Weather Underground (WU)

Morning Forecast

Updated: 01-18-26 at 9:20 am
Goal Forecast Day Day +1 Day +2 Day +3
± 2.0° C High Low High Low High Low High Low
Date WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS
01-18-26 11   11 5   7 11   11 8   8 10   10 6   7 9   10 7   8
01-17-26 10 10.9 10 6 6.3 7 10   10 5   5 11   11 7   8 10   11 6   7
01-16-26 10 10.6 10 7 5.6 7 10 10.9 11 6 6.3 7 10   10 6   6 10   10 6   6
01-15-26 10 8.8 10 4 2.3 5 10 10.6 10 7 5.6 7 10 10.9 10 6 6.3 6 9   10 6   7
01-14-26 8 7.1 7 7 7.1 6 9 8.8 9 4 2.3 5 10 10.6 11 5 5.6 6 10 10.9 9 6 6.3 6
01-13-26 11 10.2 11 0 -0.7 2 7 7.1 8 6 7.1 6 9 8.8 10 6 2.3 6 10 10.6 10 5 5.6 6
01-12-26 11 11.1 11 9 6.4 9 11 10.2 11 1 -0.7 2 7 7.1 7 5 7.1 4 9 8.8 10 5 2.3 4
01-11-26 8 6.8 6 7 6.8 5 11 11.1 11 8 6.4 7 11 10.2 11 4 -0.7 2 8 7.1 7 6 7.1 4
01-10-26 4 2.9 4 -2 -2.3 -1 8 6.8 6 7 6.8 -1 12 11.1 11 9 6.4 7 11 10.2 11 5 -0.7 4
01-09-26 5 3.6 4 0 1.3 2 4 2.9 4 -2 -2.3 0 8 6.8 5 7 6.8 0 12 11.1 13 8 6.4 7
01-08-26 6 4.7 6 3 2.3 5 5 3.6 6 1 1.3 1 4 2.9 5 -1 -2.3 2 7 6.8 6 7 6.8 2
01-07-26 6 5.9 5 1 1.7 2 6 4.7 5 2 2.3 1 4 3.6 4 1 1.3 2 4 2.9 4 -2 -2.3 1
01-06-26 4 2.9 3 1 1.4 2 5 5.9 5 1 1.7 2 6 4.7 5 3 2.3 2 5 3.6 6 1 1.3 3
01-05-26 3 1.8 3 -7 -4.8 -4 4 2.9 3 1 1.4 -2 5 5.9 4 2 1.7 0 5 4.7 6 2 2.3 2
Results WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS
# Succ 13 13 11 9 12 11 12 7 11 10 7 6 10 9 8 6
% Succ 100.0   100.0 84.6   69.2 100.0   91.7 100.0   58.3 100.0   90.9 63.6   54.5 100.0   90.0 80.0   60.0
Ave Error 0.9   0.7 1.0   1.5 0.8   0.7 0.8   2.1 0.8   0.9 1.5   2.2 0.7   1.2 1.3   2.1
Net Error 0.7   0.2 0.2   1.0 0.4   0.3 0.3   -0.3 0.3   0.0 0.9   0.0 0.4   0.5 0.8   0.4
Std Dev 0.5   0.4 0.7   0.9 0.5   0.7 0.7   2.1 0.5   0.8 1.6   2.2 0.5   0.9 1.7   1.8