Weather on September 17 in Ottawa

Historical weather data for September 17 in Ottawa, Canada

Avg High21°C (69°F)
Avg Low9°C (49°F)
Warmest201823°C
Coldest19737°C

Based on 55 years of data from OTTAWA CDA

About This Date

September 17th in Ottawa, Canada typically brings mild fall weather, with average highs around 21°C and lows near 9°C. Over 55 years of records, the warmest September 17th was in 2018 (23°C average), while the coldest was 1973 (7°C) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 36% of September 17th dates historically, with the wettest September 17th recording 4.45" of rain. The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.

The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.

Planning for September 17th in Ottawa? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.

Year by Year History

YearHighLowPrecip
202526°C (79°F)9°C (49°F)--
202429°C (84°F)13°C (55°F)0"
202324°C (75°F)13°C (55°F)0"
202220°C (68°F)7°C (45°F)0"
202127°C (80°F)10°C (50°F)0"
202014°C (58°F)4°C (40°F)0"
201922°C (72°F)6°C (42°F)0"
201830°C (86°F)16°C (60°F)0"
201728°C (83°F)16°C (60°F)0"
201623°C (73°F)11°C (52°F)4.45"
201528°C (83°F)15°C (59°F)0"
201418°C (65°F)6°C (42°F)0.8"
201318°C (64°F)2°C (35°F)0"
201226°C (78°F)8°C (46°F)0.05"
201118°C (64°F)1°C (34°F)0"
201018°C (64°F)6°C (43°F)0"
200920°C (68°F)6°C (42°F)0"
200822°C (71°F)8°C (47°F)0.07"
200720°C (68°F)3°C (37°F)0"
200623°C (74°F)12°C (54°F)0"
200518°C (64°F)16°C (60°F)0.66"
200417°C (62°F)12°C (53°F)0"
200324°C (75°F)7°C (45°F)0"
200224°C (76°F)9°C (49°F)0"
200124°C (76°F)7°C (44°F)0"
200021°C (70°F)7°C (45°F)0.22"
199919°C (67°F)12°C (54°F)0"
199823°C (73°F)7°C (45°F)0"
199722°C (71°F)8°C (46°F)0.76"
199622°C (71°F)13°C (55°F)0"
199520°C (68°F)16°C (60°F)0"
199423°C (74°F)17°C (62°F)0.02"
199314°C (58°F)8°C (46°F)0.45"
199223°C (73°F)19°C (66°F)0.16"
199124°C (75°F)17°C (63°F)0"
199012°C (54°F)4°C (40°F)0"
198918°C (64°F)13°C (55°F)0.04"
198816°C (60°F)9°C (48°F)0.58"
198718°C (64°F)9°C (49°F)0"
198614°C (58°F)2°C (36°F)0"
198524°C (75°F)5°C (41°F)0"
198420°C (68°F)3°C (38°F)0"
198320°C (68°F)11°C (52°F)0.26"
198216°C (61°F)8°C (46°F)1.64"
198117°C (63°F)6°C (43°F)0.22"
198021°C (69°F)13°C (55°F)0.44"
197924°C (76°F)10°C (50°F)0"
197814°C (57°F)3°C (38°F)0"
197718°C (64°F)12°C (54°F)0.36"
197625°C (77°F)16°C (60°F)3"
197518°C (65°F)13°C (55°F)0"
197419°C (67°F)8°C (46°F)0.1"
197313°C (55°F)0°C (32°F)1.24"
197227°C (80°F)16°C (61°F)0"
197115°C (59°F)13°C (56°F)0"

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